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Reticle 21mm Concentric Circles 1mm Increments/Crosshair This Reticle is used for Diameter, Radius, Hole Centering and Concentricity measurements. It has a line width of .001”± .00 01” and all features are true position within .00004”/.001mm. It can also be used as a Boresight and Alignment Reticle.The Pattern consists of a Crosshair and Ten Concentric Circles from 1.0mm diameter to 10.0mm diameter in 1.0mm diameter increments and is right reading looking through the glass so that the pattern can be in direct contact with the object to be measured.The Reticle Pattern is very durable, double layer, deposited evaporative Chrome/Chrome Oxide, for a reflectivity of less than 5% looking at the pattern. The Patterns on all Reticles manufactured by Max Levy are replicated from Precision Chrome on Glass Tooling under clean room conditions. Click here to download drawing 21mm Compatibility Chart Full Compatibility Chart Show more